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Showing 1 to 20 of 82 for “"Triaxial tests"”.
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The behaviour of clay in simple shear and triaxial tests
… shear test results are described. Laboratory tests were conducted using the NGI simple shear apparatus, standard shear box arid computer controlled stress path testing equipment for samples with38 mm and 100 mm diameter. The test programme comprised simple shear and shear box tests on …
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The influence of loading rate on excess pore pressures in triaxial tests
… with coupled loading and consolidation in triaxial tests and with selection of rates of loading in routine tests to avoid errors due to incomplete drainage or non-uniform pore pressures in fine grained soils. The work consisted of a combination of laboratory tests in which pore pressures …
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Comparison of direct shear and triaxial tests for measurement of shear strength of sand
… and earth-retaining structures. Direct shear and triaxial tests are the most popular laboratory methods to determine these parameters. The direct shear test is used widely because it is simple and quick. The test has several disadvantages, however. The non-uniform stress-strain behavior, the …
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Investigation of stabilized Berea Red soil with emphasis on tensile and cyclic triaxial tests
… lime stabilized Berea Red soil. Consolidometer tests were performed on natural and lime or cement stabilized soil at various densities to establish the compressibility and collapse potential. A computer controlled Indirect Tensile Testing with data logging facilities was developed in apparatus …
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Għadira sands as compared to normally consolidated deposits at Marsa (Ta’ Ċeppuna) : using static triaxial tests
… are being presented. A series of nine undrained triaxial compression tests were performed on these soils, at three different confining pressures, ranging from 55 to 1200kPa for clean sands, and 200 to 800kPa for the alluvial deposits. The behaviour of clean sands was observed to follow the …
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Comparison and Correction of Multistage Triaxial Tests to Single Stage Triaxial Test for the Rock Mechanical Testing
… between two test protocols; the Single Stage Triaxial (SST) is where a constant confining stress is applied and the axial stress is raised until the sample fails. This is compared to the Multistage Triaxial (MST) test, where the sample is loaded to the point of positive dilatency (PPD) then …
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An Examination of the Validity of Steady State Shear Strength Determination Using Isotropically Consolidated Undrained Triaxial Tests
… isotropically consolidated undrained (ICU) triaxial tests. The triaxial test was developed for measuring peak strengths, which typically occur at small strains, but steady state conditions typically occur at much larger strains. At large strain levels, the suitability of conventional …
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Liquefaction Susceptibility of Uncemented Calcareous Sands From Puerto Rico by Cyclic Triaxial Testing
Laboratory tests were performed to investigate the liquefaction susceptibility of uncemented calcareous sands. A series of isotropically consolidated undrained monotonic and cyclic triaxial tests were performed using the Playa Santa sand from Porto Rico. Playa Santa sand is a poorly graded …
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A parametric investigation on the shear strength and bearing capacity of Cenozoic Berea Red Sand with geosynthetic reinforcements
… through a suite of consolidated undrained triaxial tests. The triaxial tests provided an appropriate technique to study the effects of stress and strain correlation as well as in obtaining the parameters needed to calculate bearing capacity and shear strength. The triaxial tests compared …
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Determinação dos parâmetros de resistência, "Creep" e de Relaxação de Tensões de uma argila mole do Rio de Janeiro
… is analysed. The stress-strain curves of the triaxial tests are represented by the hyperbolic formula. The strength and stress-strain parametersare determined and compared with those of other clays. The results of triaxial tests performed on undisturbed and disturbed samples are discussed. The …
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Stress-density relationships for an agricultural soil
Triaxial tests under high loading rates and different confining pressures simulate the multi-pass effect of a tractor wheel loading on the soil. A volume measuring technique was developed to be used in triaxial tests conducted under high loading rates. A sandy clay agricultural soil was tested …
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Ensaios triaxiais de compressão e extensão na argila cinza do Rio de Janeiro em Botafogo
… compression and extension consolidated-undrained triaxial tests. The disturbance of the block soil samples was dealt with by means of the SHANSEP Method, which requires consolidation of the soil specimens under effective stresses several times higher than the existing field effective stresses. …
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Effects of maximum particle size and sample scaling on the mechanical behavior of mine waste rock; a critical state approach
… axisymmetric compression using a conventional triaxial device. Results from conventional triaxial tests in drained isotropic and monotonic axisymmetric compression were systematically compared to results presented by Fox (2011) for 150-mm-diamer, 300-mm-tall specimens with a maximum particle …
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The undrained behavior of saturated, dilatant silts
… the erratic undrained behavior often observed in triaxial tests on saturated, dilatant silts. The literature indicates that ground water contains various amounts of dissolved gases and that gases dissolved in soil pore water will have sufficient time to exit solution to some extent, due to the …
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The use of plasticity theory in predicting the deformational behavior of ice and sand-ice systems
Results of triaxial and indentation tests on ice and sand-ice samples are reported. The main parameters studied in the triaxial tests were temperature (-12 to 35°F), confining pressure (atmospheric to 4, psi), and loading rate (2.5 - 25 psi/sec). All of the indentation tests were conducted at …
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Strength of transversely isotropic rocks
… of transversely isotropic rocks under true triaxial stress states. One major obstacle in formulating an anisotropic criterion is that it usually involves six stress components, instead of three principal stresses. As such, anisotropic criteria usually lead to complicated mathematical …
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Effect of Confinement and Temperature on the Behavior of EPS Geofoam
… not considered in practice. A series of triaxial compression tests were conducted on EPS geofoams of different densities over a range of confining pressures. Results from the investigation indicate increases in confinement lead to decrease in yield stress and post yield compressive …
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Modelling including associated testing of cohesive soil using disturbed state concept
… of disturbance. Comprehensive laboratory tests have been performed on undisturbed clay samples procured from Sabine Pass, near Houston, Texas. The tests include conventional cylindrical triaxial tests and also cyclic triaxial tests in the multiaxial device with pore water pressure …
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Sistema automático de aquisição de dados para ensaio triaxial
… The use of these systems for geotechnical tests and the dificulties that may arise when implementing these systems are emphasised. The data acquisition system at the COPPE Geotechnical Laboratory is subsequently described. This system was used to log undrained triaxial tests, the results of …
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Análise da ruptura de um aterro sanitário sobre a argila mole do Caju
… embankment consists of a sanitary fill. Index tests were performed to obtain the geotechnical characteristics of the soft clay material, wich were compared with another well known clays. Oedometer tests, in situ and laboratory vane tests, and triaxial tests, were also carried out. Total stress …
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